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| Number | Title | Issue Date |
| 7409067 | Method and apparatus for adjusting frequency characteristic of signal In a frequency characteristic adjustment apparatus incorporated in an audio system, a frequency characteristic of an audio signal is made to agree with a target frequency characteristic, thus providing an equalizing function. In the apparatus, by a frequency charact... | 08/05/2008 |
| 7388959 | Harmonic generator and pre-amp A Harmonic Generator for audio applications and a Pre-Amplifier circuit are combined to form a Harmonic Generator and Pre-Amplifier circuit. The Harmonic Generator is formed from a Buffer Circuit responsive to an input program signal for buffering the input program ... | 06/17/2008 |
| 7266205 | Linearized filter band equipment and processes A method for use with equipment having filters, the method characterized by multiplying a matrix having a specified cut-boost setting of a filter of a graphic equalizer by a correction matrix to create a matrix having a corrected cut-boost setting of the filter of t... | 09/04/2007 |
| 7145944 | Equalizer containing a plurality of interference correcting equalizer sections An equalizer includes at least two first mutually interfering equalizer sections, and at least two second interference-correcting equalizer sections, arranged in series. Each of the second equalizer sections corresponds with one first equalizer section, such that al... | 12/05/2006 |
| 7113602 | Apparatus for adjustable positioning of virtual sound source An acoustic apparatus comprises an attenuator for attenuating a first audio signal to produce a second audio signal, a low pass filter for reducing high frequency components of the second audio signal to produce a third audio signal, a differential amplifier operati... | 09/26/2006 |
| 6996445 | Sound volume adjustment system in personal computer and sound volume adjustment method thereof The sound volume adjustment system for a personal computer includes a memory in which sound volume setting information set for each application is registered, and a sound volume adjustment control unit for adjusting, for each application, sound volume data transferr... | 02/07/2006 |
| 6791433 | Signal processing by means of resonators Scheme for processing an input signal A(t) by N resonators (17), each having parameters characterizing it, to generate N individual output signals. Then each of the N individual output signals is weighted using a corresponding weight to generate N individual ... | 09/14/2004 |
| 6751323 | Electroacoustic apparatus having ringing signal generation means capable of producing a subjective bass perception An electroacoustic transducer (1) includes a ringing signal generation means (20) for generating a ringing signal (CS) and an electroacoustic transducer (9) for the acoustic reproduction of the ringing signal (CS), in which the ringing signal ge... | 06/15/2004 |
| 6587566 | Sound field forming circuit and sound field forming apparatus A sound field forming circuit includes a first switch portion which switchingly supplies one of an audio signals from a sound source and a second tone control circuit which variably adjusts a characteristic of a second predetermined frequency band, to a f... | 07/01/2003 |
| 6396934 | Analog audio filter for high frequencies The present invention relates to an active analog filter including a differential amplifier, an output of which provides a filtered signal and a non-inverting input of which is connected to a median potential between supply potentials of the amplifier, a ... | 05/28/2002 |
| 6317117 | User interface for the control of an audio spectrum filter processor A user interface control apparatus is disclosed for the control of electronic filter parameters of audio spectrum equalizers, crossovers, and other filter processors. The user interface apparatus comprises five pushbutton keys arranged in a specific cross... | 11/13/2001 |
| 6101257 | Audio signal processor An audio signal processor is disclosed which has at least one audio signal input and at least one audio signal output as well as at least one control input, and an audio signal processing unit connected between audio signal input and audio signal output, ... | 08/08/2000 |
| 6088460 | Equalizer and audio device using the same An equalizer includes first and second differential amplifiers which have a common output and respective separate current sources, a first negative feed back circuit which feeds back a voltage signal extracted from the common output to the first different... | 07/11/2000 |
| 5987065 | Adaptive equalizer An equalizer comprising a pair of high pass filters for receiving an input signal, each filter having gain, a first of the filters having gain which is substantially flat within its passband, a second of the filters having gain over a range of its passban... | 11/16/1999 |
| 5982907 | Audio signal waveform emphasis processing device and method An audio signal waveform emphasis processing device performs even-order integration on an input audio signal using one or a plurality of double integrators and even-order differentiation on the input audio signal using one or a plurality of double differe... | 11/09/1999 |
| 5974156 | Circuit arrangement for influencing the frequency response of a digital audio signal A digital circuit arrangement for influencing the frequency response of a digital audio signal as a function of frequency and/or amplitude, in which the input signal of the digital circuit arrangement is applied to a signal filter (3) having variable filt... | 10/26/1999 |
| 5949821 | Method and apparatus for correcting phase and gain imbalance between in-phase (I) and quadrature (Q) components of a received signal based on a determination of peak amplitudes A communication device (100) includes an equalizer (126) for correcting imbalance between in-phase and quadrature components of a received signal. The equalizer (126) determines peak amplitude for the in-phase and quadrature components, and the phase imba... | 09/07/1999 |
| 5754668 | Equalizer and audio device using the same An equalizer includes first and second differential amplifiers which have a common output and respective separate current sources, a first negative feed back circuit which feeds back a voltage signal extracted from the common output to the first different... | 05/19/1998 |
| 5727074 | Method and apparatus for digital filtering of audio signals The present invention provides an efficient audio equalization system in terms of the number of coefficients and taps of a digital filter. The processing efficiency of the system allows it to provide audio equalization with high resolution at low frequenc... | 03/10/1998 |
| 5714918 | Equalizer for digitized signals In an equalizer with n number of frequency ranges for digitized signals in which by means of n-1 cascaded filter circuits containing parallel connected digital low-pass filters and digital high pass filters whose respective frequency responses are linked ... | 02/03/1998 |
| 5692051 | Electronic equalization for recessed loudspeaker mounting An equalizing circuit, for compensating frequency response perturbations in a loudspeaker caused by a recessed mounting of the loudspeaker, includes an input for receiving an audio signal, a peaking network coupled to the input for augmenting the audio si... | 11/25/1997 |
| 5539833 | Audio signal amplifier device An audio signal amplifier device is disclosed, and includes two parallel compass controller circuits (6, 7), each of the circuits (6, 7) having the identical configuration and including a low compass controlling circuit (1, 8) having a plurality of transf... | 07/23/1996 |
| 5530769 | Equalizer and audio device using the same An equalizer includes: a first attenuating circuit which receives an input signal and a first control signal and attenuates the input signal depending on the level of the first control signal; a filter having a predetermined frequency band which receives ... | 06/25/1996 |
| 5524290 | Adaptive graphic equalizer and radio using same An adaptive graphic equalizer (200, 400) has various ordinarily fixed parameters (such as center frequencies, filter bandwidths, and step response sensitivity) that are automatically altered to suit a particular audio source. In one embodiment, a radio (1... | 06/04/1996 |
| 5509080 | Bass clipping circuit A clipping circuit is coupled across the bass feedback shunt capacitor in an amplifier circuit to effectively reduce only high level bass signals while allowing level high frequencies to pass and allowing full boost to low level, low frequency signals.... | 04/16/1996 |
| 5459791 | Audio frequency filter An audio frequency filter for a mixing console equalizer typically has a manual frequency control for setting its operating frequency range, and a manual gain control for controlling the gain of the filter independently of the set frequency range. The pre... | 10/17/1995 |
| 5327102 | Sound recording apparatus A sound recording apparatus for equalizing a sound signal before the sound signal is recorded onto a recording medium includes an amplifier to which the sound signal is inputted and a simulated inductor circuit connected to the amplifier. The simulated in... | 07/05/1994 |
| 5305388 | Bass compensation circuit for use in sound reproduction device A bass compensation circuit for use in a sound reproduction device is provided with a second-order positive feedback type high-pass filter. The filter has an operational amplifier and a first positive feedback resistor, a first variable resistor connected... | 04/19/1994 |
| 5297075 | Computer controlled transversal equalizer An adjustable equalizer network has a series chain of N all pass amplifier stages driving N+1 scaling circuits connected to a final summing circuit that adjusts the frequency response at M+1 frequency control points to obtain a predetermined ripple free m... | 03/22/1994 |
| 5282252 | Audio equalizer providing reciprocal equalization plus infinite-depth notch Audio equalizer circuit for adjusting the amount of boost and cut. The circuit uses a combination negative feedback, positive feedback, negative feed-forward and positive feed-forward resulting in boost and cut characteristics which are entirely reciproca... | 01/25/1994 |
| 5210806 | Digital audio signal processing apparatus Disclosed herein is a digital audio signal processing apparatus of a type wherein a graphic equalizer including a plurality of filters connected in series to one another is subjected to arithmetic operation processing to be defined to thereby output the r... | 05/11/1993 |
| 5201009 | Signal processor An operational amplifier (1) and resistors (11) and (12) damp an input signal (V1) by -6dB. Since a positive input terminal of the operational amplifier (1) is fixed at -3V, DC component of the input signal (V1) is down-shifted to -3... | 04/06/1993 |
| 5091956 | Adaptive high pass filter having cut-off frequency controllable responsive to input signal and operating method therefor An adaptive high pass filter comprises a switched capacitor filter (11) operable as a high pass filter, detecting circuits (14, 15, 16) for detecting low frequency signal components included in an input signal (Vi) and control circuits (17, 18,... | 02/25/1992 |
| 5050217 | Dynamic noise reduction and spectral restoration system An audio processor consisting of a "single-ended" dynamic noise reduction system cascaded and cross-coupled with a program-adaptive dynamic equalizer. The audio at the output has a consistent subjective spectral texture even if the spectral texture of the... | 09/17/1991 |
| 5046105 | Audio signal equalizer having accelerated slope phase shift compensated filters A tone control shelving equalizer providing low shelf (bass) boost and cut, and high shelf (treble) boost and cut is disclosed wherein the active filter stages provide sharpened (accelerated) amplitude versus frequency response characteristics at the band... | 09/03/1991 |
| 4994770 | Tone control device An improved tone control device for controlling a tone within an audio frequency range in a combined mode of fine compensation for frequency characteristic as in the graphic equalizer and coarse tone control as in the bass/treble tone control circuit by m... | 02/19/1991 |
| 4972489 | Sound reproducing apparatus A sound reproduction system suitable for automobile, the reproduction system having a band-pass filter, a phase-shifter for shifting the output of the band-pass filter and a mixer which mixes the output of the phase-shifter with the original audio signal ... | 11/20/1990 |
| 4955058 | Apparatus and method for equalizing a soundfield Apparatus for equalizing a soundfield comprises an amplifier and a gain control circuit for selectively adjusting the gain of the amplifier as a function of frequency in response to data values received by the gain control circuit. The apparatus has power... | 09/04/1990 |
| 4939782 | Self-compensating equalizer A multi-band graphic equalizer is provided that includes a plurality of controllable frequency response determining elements, each element having a primary effect in its primary frequency band and a secondary effect in at least one adjacent frequency band... | 07/03/1990 |
| 4891841 | Reciprocal, subtractive, audio spectrum equalizer An equalizer circuit is disclosed having adjustable bandpass filters connected with operational amplifiers in feedforward and feedback paths so as to form frequency selective boost and cut signal components, which are then combined to form the equalized o... | 01/02/1990 |
